化学方法改良吹填土固结沉降性质研究

大连市大窑湾港区的吹填土为高分散性低液限粉质黏土，其特点是亲水性高，含水量大，排水率低，这造成了吹填土承载力低，在荷载作用下变形量大，在很长一段时间内无法作为正常建筑地基使用.通过在盐水环境下添加不同剂量的浓度为0.1%的絮凝剂Praestol-2515或Praestol-650溶液，可以观察到土颗粒迅速聚合，土粒粒径明显增大，粒间胶结更加均匀和紧密，形成絮状物，从而促进了土颗粒与自由水分的分离，导致过饱和吹填土（悬浊液）沉降速度大大提高，极大地缩短了吹填土的排水固结时间，在短期内达到建筑地基所需要的变形量和承载能力.研究结果对于沿海地区过饱和吹填土的造陆工程，以及类似的高含水率黏性土的地基处理具有重要的启示意义.

The research of chemical methods in improving dredger fill's settlement consolidation properties

The dredger fill of Dayaowan port in Dalian city,China is silty clay with high dispersion and low liq-uid limit.It is mainly characterized with high hydrophilicity,high moisture content and low drainage rate,and in turn,leading to its low bearing capacity,big deformation under load.It can not be used as a kind of architectural foundation soil for a long time.By means of adding different doses of flocculant Praestol-2515 or Praestol-650 with a concentration 0.1% in the salt water,it was observed visually that soil particle flocculated rapidly,and that the interparticles′cement tended to be more uniformly and strongly.The particals turned into flocculus and its size increased,resulting in separation between free moisture and soil particle,and increasing settlement′s speed and shortening drainage consolidation time.Consequently,the dredger fill can get enough bearing capacity to serve as a kind of architectural foundation soil.